Superhydrophobic coatings with high repellency to daily consumed liquid foods based on food grade waxes.
Superhydrophobic coatings with high repellency to daily consumed liquid foods based on food grade waxes.
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DOI：
10.1016/j.jcis.2018.01.034
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发表时间：
2018-04
影响因子：
9.9
通讯作者：
Xia Zhao;Tao Hu;Junping Zhang
中科院分区：
文献类型：
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作者：
Xia Zhao;Tao Hu;Junping Zhang
超疏水涂层在日常生活中的应用越来越受到人们的关注。在这里，我们报告了一种基于食品级蜡制备对日常食用液体食品具有高排斥性的超疏水涂层的通用方法。通过喷涂乙醇中的均匀蜡悬浮液，然后在 40°C 下退火来制备涂层。由于蜡在乙醇中的独特溶解度，通过加热溶解-冷却沉淀-超声过程形成蜡悬浮液。蜡悬浮液的超声波处理有助于通过减小蜡微片的尺寸来提高超疏水性。 40°C 退火可以增强涂层的机械稳定性。该涂层具有超疏水性，水接触角为158.2°，滑动角为7.3°。该涂层可抵抗强烈的水喷射和腐蚀性水溶液的浸泡。此外，该涂层对可乐、蜂蜜、牛奶和酸奶等各种液体食品表现出优异的抗粘性能。此外，该涂层适用于不同的基材（例如载玻片、PET板和聚乙烯板），并且可以使用不同的蜡（例如石蜡、蜂蜡和微晶蜡）制备。我们相信蜡超疏水涂层可以在液体食品防粘、水果保鲜和抗生物粘附等各个领域得到应用。
The applications of superhydrophobic coatings in daily life are receiving increasing attention. Here, we report a general approach for preparing superhydrophobic coatings with high repellency to daily consumed liquid foods based on food grade waxes. The coatings are prepared by spray-coating the homogeneous wax suspensions in ethanol followed by annealing at 40 °C. The wax suspensions are formed by the heating dissolution-cooling precipitation-ultrasonication process thanks to the unique solubility of the waxes in ethanol. Ultrasonication of the wax suspension is helpful to improve superhydrophobicity by reducing the size of the wax microplatelets. Annealing at 40 °C could enhance mechanical stability of the coatings. The coatings are superhydrophobic with a water contact angle of 158.2° and a sliding angle of 7.3°. The coatings are resistant to intense water jetting and immersion in corrosive aqueous solutions. In addition, the coatings show excellent anti-adhesive properties for various liquid foods including cola, honey, milk and yoghourt. Moreover, the coatings are applicable onto different substrates (e.g., glass slide, PET plate and polyethylene plate) and could be prepared using different waxes (e.g., paraffin wax, beeswax and microcrystalline wax). We believe that the wax superhydrophobic coatings could find applications in various fields such as anti-adhesion of liquid foods, fruit preservation and anti-bioadhesion, etc.